HomeEnergyMeter/main/led_test_inout.c

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/ledc.h"
#include "driver/pcnt.h"
#include "esp_attr.h"
#include "esp_log.h"

#include "config.h"

/* Configure LED PWM Controller
 * to output sample pulses at 1 Hz with duty of about 10%
 */
void ledc_init(void)
{
    // Prepare and then apply the LEDC PWM timer configuration
    ledc_timer_config_t ledc_timer;
    ledc_timer.speed_mode       = LEDC_LOW_SPEED_MODE;
    ledc_timer.timer_num        = LEDC_TIMER_0;
    ledc_timer.duty_resolution  = LEDC_TIMER_13_BIT;
    ledc_timer.freq_hz          = 14;
    ledc_timer.clk_cfg          = LEDC_AUTO_CLK;
    ledc_timer_config(&ledc_timer);

    // Prepare and then apply the LEDC PWM channel configuration
    ledc_channel_config_t ledc_channel;
    ledc_channel.speed_mode = LEDC_LOW_SPEED_MODE;
    ledc_channel.channel    = LEDC_CHANNEL_0;
    ledc_channel.timer_sel  = LEDC_TIMER_0;
    ledc_channel.intr_type  = LEDC_INTR_DISABLE;
    ledc_channel.gpio_num   = LEDC_OUTPUT_IO;
    ledc_channel.duty       = 0; // set duty at about 10%
    ledc_channel.hpoint     = 0;
    ledc_channel_config(&ledc_channel);

    // Set duty to 50%
    ESP_ERROR_CHECK(ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, 409)); // Set duty to 5%. ((2 ** 13) - 1) * 50% = 409
    // Update duty to apply the new value
    ESP_ERROR_CHECK(ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0));
}